单项选择题

When he just got off the plane, he gave us a good description of ______ in Africa.

A．what he had seen
B．that he had seen
C．which he had seen
D．he had seen what
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单项选择题
She treats me ______ I were a stranger.
A．like
B．likely,
C．as if
D．seem
单项选择题
Half of those books ______ best-sellers.
A．is
B．are
C．am
D．was
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